Holding device for hand tools



M y 22, 1951 G. F. WAGSTAFF 2,554,283 HOLDING DEVICE FOR HAND TOOLSFiled May 2, 1949 2 Sheets-Sheet 1 llllll] Invemor Giana-F flvsraz-F May22, 1951 2 Sheets-Sheet 2 Filed May 2, 194

/ a4 Attorneys Patented May 22, 1951 George F? Wagstafi; Cheltenham,England; assig'nor to: Delapena' & Son Limited, Gheltenham, EnglandApplication May Z, 1949, Serial No. 90,928 In Great Britain May 3, I9488 Claims. 1

This invention relates to holding devices for hand tools, such forexample as laps or bones, to enable them to be manipulated with respectto the work.

In the lapping or honin of pins, plugs or other pieces of work it isusual to'mount the work between centres and rotateit while holding theexternal lap or hone therearound. This procedure is adopted especiallywhen the work is of considerable length, such as an engine crankshaftforexample, and with the work so mounted it becomes very desirable to havesome form of holding device for the tool which may in any event be toolarge to hold in the hand. The crankpins' of the shaft, of course,perform a gyratory or orbital motion and when lapping o'rhoning thesepins it is absolutely essential that a holding device be provided forthe lap or hone to enable the tool to be accurately held on to the work.

The main object of the invention is to provide a simple and efficientholding device for hand tools which enables the'to'ol to be'efficientlyand accurately manipulated with respect to the work.

According to the invention the took-holding device comprises aframe-element, to opposite points of which the tool ispivoted so that itlies substantially within the frame, and coaxial handle membersextending outwardly from the frame in opposite directions.

Preferably the frame element is gapped, being preferably substantiallyC-shape'd, with the tool pivoted to the upper and lower portions thereofwhile the handle members extend from the lower end of the c and theopposite point of the closed portion of the latter.

Two forms of the invention in which the'toolholding device isconstructed to constitute a holder for a hand-held bone, for example theexternal hone described in the specification of co-pending applicationfor Letters Patent No. 772,450" will now be described, by way ofexample, with reference to the accompanying drawings; in which:

Figure 1 is a part-sectional broken side elevation of the holding devicewith the hone mounted therein, the latter bein carried within the frameelement of "the holding device on inwardly projecting pivots;

Figure 2 is a part -sectionalend view of the arrangement shownin'Figure1,

Figure 3 is apart-sectional side elevation of a modification of" theholding device inwhich the 'fram'e element of the latter passes through2: the jaws of the hone which is mounted on outwardly projecting pivots,

Figure 4 is an end view of the holding device and hone illustrated inFigure 3, and

Figure 5 is a detail sectional view on the line 55 of Figure 4.

Referring to Figures 1 and 2 of the drawings, the arrangement showntherein is particularly suitable for dealin with narrow surfaces ofwork, especially if the latter perform a gyratory or orbital movementabout therotational centre of the work, such for example as thecrankpins of a crankshaft. The frame; element Ill is of substantiallyC-shape (laterally inverted as illustrated) and is formed of barmaterial bent to provide short upper and lower horizontal portions H, l2and a vertical portion 13 which, together with inclined portions Ill,-l5 joining the latter to the aforesaid short upper and lower horizontalportions, forms the closed part of the C. From the outer end of thelower horizontal portion l2 an inclined portion l6 extends outwardly andupwardly to form the lower end of the c and terminates in a shortvertical portion I! which lies parallel to thevertical portion [3.

Handle members Hi, Is, a broken view of which is shown in Figure 1, ofrod-like construction and of sufficient length to clear any projectingportion of the work are positively secured by bolts 26 to the upper endof the short vertical portion I! and to the opposite point of thevertical portion I3, the handle members being knurled for a portion oftheir length, as shown at [812, and terminating at'their outer ends inknobs l8a, [9a to facilitate handling.

The hone comprises two jaws 2|, 22 hinged together by a hinge pin 23',the free ends of the jaws being connected by an adjusting screw 24 oneend of which is non-rotatably retained in a swivel member 26 mounted inthe free end of the jaw 22 while its threaded end 24a lies in abifurcated end 25 of the jaw 2| and is provided with a nut member 241).A holder 2! carrying a pair of abrasive elements 21a mounted in Vrelationship is secured to the jaw 2| whilst a V-shaped guide 28 ismounted on the other jaw 22.

From opposite points of the short upper and lower horizontal portionsll, I2 of the frame Ill pivot pins 29, 38 project inwardly, the upperpivot pin '29 taking into a recessed lug 3! formed at the end of the jaw22 of the hone which car-- ries the swivel member 26' while the lowerpivot pin 39 enters a recessed'lug, 32" at the hinged end of the jaw.The other jaw of the hone thus extends from the hinge pin 23 towards thegap in the C-shaped frame, the free bifurcated end 25 of this jaw lyingwithin the gap. The outwardly projecting handle members l8, 19 aresubstantially co-axial with the centre line of the guide 28 and abrasiveelement holder 21, this having been found of benefit in manipulating thetool with respect to the work.

From the description given it will be understood that in honing thecrankpins or main bearing portions of a crankshaft mounted betweencentres the adjusting screw 24 with its nut 24b is first lifted from thebifurcated end 25 of the free jaw 2|, under turning movement of theswivel member 26, so that it lies at one edge of the gap in the frameelement [0. The free jaw 2| may then be turned about its hinge pin 23into its extreme outward position in which its bifurcated end 25 lies atthe other edge of the gap in the frame. these positions the gap in theframe element I and the gap between the jaws 2|, 22 of the honecorrespond with each other and the complete device may be passed aroundthe portion of the crankshaft or the like which it is required to hone.The free jaw 2! of the hone is then moved into proximity with the workand the adjusting screw 24 and nut 24b returned about the axis of theswivel member 26 until the threaded end 24a enters the bifurcated end 25of the free jaw whereafter the nut 24b is tightened to bring the jaws ofthe hone into correct relationship with the work for commencing thehoning operation.

If honing is carried out by rotating the work the holding device, andthus the hone, is maintained non-rotatable by grasping the handlemembers I8, l9 by means of which the hone may also be stroked back andforth along the portion of the work being finished, as may be desired.It will be understood that, due to the pivotal mounting of the hone inthe frame element ID, the hone will be maintained in accurate alignmentwith the work during stroking or traversing despite any twist which theoperator may tend to impose thereon due to differential pressure on thetwo handle members l8, !9.

It will be understood that the holding device described enables theeffective and accurate manipulation of the hand tool with respect to thework even when a crankpin or the like which performs a gyratory ororbital movement about the rotation centre of the work is being dealtwith.

To enable manipulation of the adjusting nut 241) during such orbitalmovement the nut is extended outwardly, as shown, so that its headed end240 lies clear of any projecting portion of the work.

In the construction of holding device illustrated in Figures 3, i andthe laterally elongated substantially C-shaped frame element 33 isarranged to pass through the jaws 34, 35 of the hone, thus enabling theheight of the frame element to be reduced while the hone still liessubstantially therewithin. The frame element 33 may also in this case beformed of bar material bent to provide a short upper horizontal portion36, a vertical portion 31 forming the closed part of the C and a lowerhorizontal portion 38. The end of the latter is bent upwardly as shownat 39 to form the lower vertical end of the 0. Handle members 4?], 4!are positively secured by bolts 42 to the upper end With the parts in .i

4 of the vertical portion 39 and to the opposite point of the verticalportion 31.

From opposite points of the upper and lower horizontal portions 36, 38of the frame element 33 pivot pins 43, 43a project outwardly, the upperpivot pin 43 taking into an inwardly projecting lug 44 formed at thefree end of the jaw 35 of the hone which carries the swivel member 45whilst the lower pivot pin 43a enters an inwardly projecting lug 46 atthe hinged end of the jaw. Apertures 47 are formed in the jaw 35 toallow clearance in all directions for the horizontal portions 36, 38 ofthe frame element, an elongated aperture 48 also being formed in the jaw34 to allow the lower horizontal portion 38 to pass therethrough withoutrestricting the movement of the jaw about its hinge pin 23. As in thepreviously described arrangement, the handle members 40, 4| aresubstantially coaxial with the centre line of the guide 28 and abrasiveelement holder 21.

It will be appreciate-d that the usefulness of the holding devicesdescribed is not limted to operations in which the work is rotated, asthe devices also afford a valuable means of rotating the hone in anaccurate and properly aligned manner with respect to non-rotated work.

I claim:

1. A tool-holding device for a tool having an apertured body andcomprising in combination a rigid frame element having an aperturetherein to opposite sides of which the tool is pivoted so that it liessubstantially within the frame and bridges the aperture, and coaxialhandle members extending outwardly from the frame in opposite directionsnormal to the axis about which the tool is pivoted.

2. A tool-holding device for a tool having an apertured body andcomprising in combination a rigid frame element having an aperturetherein, pivot means coaxially arranged on opposite sides of saidaperture to which the tool is pivoted to lie substantially within theframe and bridge the aperture, and coaxial handle members extendingoutwardly from the frame in opposite directions normal to the axes ofsaid pivot means.

3. A tool-holding device according to claim 2, wherein the rigid frameelement is gapped so that the device may be passed around the desiredportion of the work which enters the aperture in the frame elementthrough said gap.

4. A tool-holding device for a tool having an apertured body at least aportion of which is of rigid construction, said device comprising incombination a rigid substantially C-shaped frame element, pivot meanscoaxially arranged on the upper and lower portions of the C on whichsaid tool is pivoted so that it lies substantially within the frameelement whilst said rigid portion bridges the gap between said portionsof the frame element, and coaxial handle members extending outwardlyfrom the lower end of the C and the opposite point of the closed portionof the latter to lie normal to the axes ofsaid pivot means.

5. A tool-holding device according to claim 2, wherein the centre lineof the outwardly projecting handle members and the centre line of saidpivot means substantially intersect the centre line of the work Withinthe aperture of the tool.

6. A tool-holding device for a tool having an apertured bodyat' least aportion of which is of rigid construction, said device comprising incombination a rigid substantially C-shaped frame element having upperand lower horizontal portions, coaxially arranged pivot pins whichproject inwardly towards each other from said horizontal portions andwhich take into recesses formed in the upper and lower ends of the rigidportion of the tool, said frame element having a vertical portionconnected to said horizontal portions to form the closed portion of theC, a short vertical portion connected to the lower horizontal portion toform the lower end of the C, and a handle member extending laterallyfrom each of said vertical portions to lie coaxial with each other andnormal to the axes of said pivot pins.

7. In combination, a tool-holding device com"- prising a rigid frameelement having a gapped aperture therein and a tool having two jawshinged one upon the other, pivot means connecting opposite ends of oneof said jaws and the frame element and arranged so that when theopposite jaw is swung outwardly about its hinge the gap between the jawsof the tool and the gap in the frame element correspond with each other,and coaxial handle members extending laterally from the frame inopposite directions normal to the axes of said pivot means.

8. The combination of a tool-holding device and a tool according toclaim 7, wherein a portion of said rigid frame element of thetool-holding device passes through an aperture formed transversely ineach jaw of the tool, the apertures formed in said jaws being insubstantial alignment with each other and of suflicient size to allowclearance in all directions for the said portion of the rigid frameelement.

GEORGE F. WAGSTAFF.

REFERENCES CITED The following references are of record in the file ofthis patent:

